Shomrim of produce may eat by virtue of common custom, but not by virtue of Biblical law.  There are four [types of] shomrim: an unpaid shomer, a borrower, a paid shomer, and a renter. An unpaid shomer swears for everything; a borrower pays for everything. A paid shomer and a renter swear concerning an animal that broke a limb, an animal that was captured, and an animal that died, and they pay for loss and theft.