Does selling goods from the warehouse to acquaintances for profit, while delaying their registration, count as trading with the institution's money without its knowledge? What is the ruling on the profits realized from this, taking into account the noble Hadith: "Do not sell what you do not possess"?

We understand that taking items is permissible provided they are registered, and the price is deducted from the recipient's dues. If this is the case, then registration acts as the offer and acceptance for the sales contract. The item remains the property of the institution until it is owned [by the employee], and it is not permissible for the worker to sell it and profit from it for himself before owning it. Selling what one does not own is not permissible in Sharia. As for delaying official registration, its validity depends on the institution's permission. Therefore, the questioner should refer to the institution's management to request permission. If they permit what he did, then his action is valid; otherwise, his action is not valid.