Found a red key card after killing tagilla but don’t know what to sell it for.

hello. i recently found a red keycard on tagilla in factory but don’t know what to sell it for. i have no interest in labs or using this keycard but i saw on the flea that there were no for sale. i was wondering if i should sell it to a trader or what to put it up for. thank you for everything. and sorry if this post seems like a mess bc i am shaking.