here's a list of items that aren't sellable via the market, please note there are exceptions to this list:
dead batslain vampire dead chicken ...
red inscribed heart golden goblet book (gemmed) gamemaster doll
vial of coconut milk vial of mead vial of oil ...
magical torch blue note ...
assassin doll omniscient owl midnight panther doll ...
silver key bone key copper key ...
soft boots with 10 minutes left dwarven ring with 2 seconds left ...
rod of destruction with imbuement attached for example ...
decorative sheets (green, blue, red)blood vial envelope from the wizards beer tap flower pots that require water ...
balloon clothsnowman package raven kits after you open for the first time (in nikos answer)
Your question is related to my answer in: Which kind of items I cannot sell on market?
*of course I didn't make a complete list of items that aren't on the market because there's a lot!
an additional list of items that can't be placed on the market (keep in mind some of this can be inaccurate but it's worth noting): https://tibia.fandom.com/wiki/Category:Non-Marketable_Items
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