fifa17-recon: the real quick-sell table, and the grouping bug is not in our layer

Multi-agent pass over the store subsystem, 11 agents, findings run through three
adversarial verifiers. Full writeup in docs/plan-2026-08-05-store-subsystem.md.

THE REAL DISCARD TABLE IS RECOVERED. quick_sell() paid an invented rating tier
(600/300/150/50) that was wrong for every single card. The real table is
fcc_discardcoins in the client's own game DB, 141 rows keyed (cardtype, level, rare),
read out of the running client and verified 22/22 against live items:

    value = round_half_up(rating * price / 100)
    level    = 3 if rating >= 75, 2 if 65..74, else 1   (0x180141e8a..0x180141ea3,
               derived from rating, NOT a wire field)
    cardtype = FUN_1800d8330(cardsubtypeid), decoded from its jump table and checked
               across every subtype 0..599 with zero disagreements

A 94-rated gold rare is 752, not 600. A 76 rare is 608, not 150. A 55 bronze is 17,
not 50.

This also closes a disagreement nobody had noticed: the CLIENT already computes and
displays the correct value locally whenever our discardValue (atom 0xd7) is 0 or
absent. FUN_18013fe00 stores our value at item +0x38 and the guard at 0x180141025
skips the local computation when it is non-zero. So the screen has been showing the
real number while the server paid a made-up one, on every quick sell ever made.

Verified beyond what the report claimed, because a missing table row pays ZERO and
that would be a regression the old flat tier could not produce: across all 236 items
in the live profile, 230 map to cardtype 1 and 6 to cardtype 6, and NOT ONE would pay
0 coins. Table reproduces at 141 rows and the worked example lands exactly.

ZERO WIRE CHANGE, FUT_DISCARD_TABLE default off. Nothing new is sent; only the coin
figure the server credits moves. This is the patch worth defaulting on after one
in-game check, which is simply quick-selling a card and seeing the coins paid match
the value the card was already displaying.

THE GROUPING BUG IS NOT IN CARDSDLL, and the fix ranked first would have wasted a
launch. Live in the running client all three display groups own exactly the right
pack, there is exactly one copy of each pack record in 4 GiB, and nothing we send is
mis-parsed. The parsed model is correct and the Scaleform layer picks the wrong pack
when turning a tile click into a category id. displayGroupAssetId is served as 1/5/6
while the screen's category field reads 3, and group tiles carry a hardcoded
CATEGORY_ID of 0. Confirmed by direct read: ordinal 3, assetId 6, i.e. Premium, while
the last click was Gold.

The heap map that made this possible, all scoped to one pid: display-group vector
control block, 3 elements of 0x108; group record fields at +0x00 sortPriority,
+0x04 displayGroupAssetId, +0x40 a one-element pack vector; inner pack record 0x1a8
with packType at +0x38, ids at +0x70/+0xac, price at +0xa0, quantities at +0xc0..+0xd0.

extPrice SHOULD BE DELETED, not corrected. Both sub-parsers read only
externalPriceId; amount and currency are discarded. Sending the key at all creates an
"mtx" currency row that switches on a real-money price line the client can never fill
offline, which is the literal "or %1s" on every tile.

A WORRY NOBODY HAD RAISED, and I confirmed it from our own logs: the client has sent
packId 6 on every purchase it has ever made, four for four tonight and six for six
across history. We have never observed a successful buy of anything but Premium Gold.

Also settled: FUT_STORE_DISPLAYGROUP=0 is the right resting state, argued from
mechanism rather than from history; FUT_USERINFO=packs stays off because the
unopened-pack counter is client-mutable and the flag ladder silently drops squadList;
POST /user is a latent hard freeze that has never fired because the client never
issues that POST.

Honest coverage: the ActionScript layer is unread by everyone and every remaining
store mystery lives there.

Live: 439 contract checks pass, market suite passes, both flags off.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

fifa17-recon/tools/ghidra_queries/q_st_group_8.py

@@ -0,0 +1,50 @@
+"""DIMENSION 1 / query 8: THE WRITERS of screen+0x290.
+
+Instruction scan found exactly two writes to +0x290 inside the store-screen
+cluster:
+    0x18007d3ba  FUN_18007d1a0  MOV dword ptr [R14 + 0x290],EBP
+    0x18007f0c0  FUN_18007e7f0  MOV dword ptr [R15 + 0x290],EAX
+Everything else at that displacement in CardsDLL is a vtable CALL/JMP or an
+unrelated object.
+
+QUESTION: what value do those two store? If it is a number that came out of the
+Flash message (the tile's ASSET_ID) rather than the group ordinal, then
+displayGroupAssetId is being used as a group ordinal and non-contiguous ids
+break the drill-down.
+
+CONTROL: FUN_18007dab0 (the reader, already decompiled) is in the same cluster
+and uses the same object; the two writers must be seen to operate on an object
+that also touches +0x294 / +0x2c8, otherwise they are a different class that
+merely shares the offset.
+"""
+import traceback
+
+OUT = "/tmp/claude-1000/-home-alex-Documents-OpenFUT/8e521ca1-ca3e-4138-bb96-df1744dd1d30/scratchpad/store/q8_out.txt"
+buf = []
+def P(*a):
+    s = " ".join(str(x) for x in a)
+    buf.append(s)
+    print(s)
+
+def C(a, label, show_callers=True):
+    P("=" * 78)
+    P(label, hex(a))
+    P("=" * 78)
+    s = dec(a)
+    P("len(src) =", len(s))
+    P(s)
+    if show_callers:
+        P("--- callers ---")
+        for ent, nm in callers(a):
+            P("   %-30s %s" % (nm, hex(ent)))
+
+try:
+    C(0x18007d1a0, "*** WRITER 1  FUN_18007d1a0 ***")
+    C(0x18007e7f0, "*** WRITER 2  FUN_18007e7f0 ***")
+    C(0x1800144a0, "FUN_1800144a0  CATEGORY_LOCACTION by server id")
+    C(0x180014ee0, "FUN_180014ee0  IS_AVAILABLE by server id")
+except Exception:
+    P(traceback.format_exc())
+
+open(OUT, "w").write("\n".join(buf))
+print("WROTE", OUT)