A listing I saw before is gone
Symptoms
A listing you saved, or one you saw in the market recently, now 404s when you open it, and no longer turns up in search or on the seller's stand page. If it was on a saved list, it just quietly isn't there anymore either.
Cause
The most common reason is the seller's Harvest Log. Listings a seller tracks batch by batch only stay visible while at least one logged batch is still in date and still has stock left — if the last batch sells out or passes its shelf life, the whole listing disappears until the seller logs a new one. This is different from a simple, untracked listing, which stays visible even at zero stock.
A listing can also come down because the seller turned it off, or because their store itself lost visibility — most often because their payout account isn't fully set up yet.
None of these are shown to you as an error; the listing just stops existing anywhere you'd find it, the same way it would if it had never been published.
Fix
There isn't anything to fix on your end — a vanished listing means the seller currently has nothing live to sell under it, not that anything went wrong with your account or your search. If you want the item again, check back later, or visit the seller's store page directly to see what else they currently have available.