No, the items we purchase under a reimbursement are ours to keep or dispose of as we will. While the thought of returning a fast food meal purchase requirement that you were required to eat on site is delightful (plastic bag or loose in a box?),the issue does not arise. While some shops specify that merchandise purchases cannot be returned, many of them do not specify this, so the option is yours as an individual (instead of as their independent contractor shopper) whether to return it or not. Many shops specifically prohibit the purchase of lottery tickets, gift cards or alcohol to complete a purchase requirement. But in general, unless specified othewise, a reimbursement is for your purchase with no further claim to the material by the company.