Package market is the platform's immutable fixed-price market (design §2.5.4). It never holds a token: the seller approves this realm in core, the token stays in the seller's wallet, and Buy moves it through core's official grc721 RealmTeller in the same transaction that pays everyone. It never holds coins either (I-3).
Stale listings (RA H-2) cannot be bought: a listing pins the token's move counter and core's approval nonces at listing time, and Buy requires owner == seller, the counter unchanged and the approval it was listed under still in place, unchanged (I-8). Once stale, a listing stays dead: approving the market again later never revives it (SA-L3). A stale listing never blocks the new owner: List overwrites it and anyone may CancelStale it.
Pause ("trade" in core) stops List and Buy only. Cancel, CancelStale and UpdatePrice are never paused (I-2).