Deemed Acceptance under the UCC

"Under Missouri law, a lessee is deemed to have accepted leased goods if, after the lessee has had a reasonable opportunity to inspect the goods, the lessee signifies or acts in a manner that signifies to the lessor or the supplier that the goods are conforming or that the lessee will take or retain the goods despite any nonconformity; or the lessee fails to make an effective rejection of the goods within a reasonable time after the delivery of the goods. Acceptance of part of any commercial unit is acceptance of the entire unit. MO. REV. STAT. § 400.2A-515

If the goods or tender or delivery fail to conform to the lease contract, the lessee may reject or accept the goods or accept any commercial unit or units and reject the rest of the goods. Such rejection must be within a reasonable time after tender or delivery and seasonably notify the lessor. MO. REV. STAT. § 400.2A-509

A lessee's acceptance of goods precludes rejection of the goods if made with knowledge of a nonconformity. A lessee of a finance lease who has already accepted the goods with knowledge of a nonconformity, however, cannot revoke his acceptance. MO. REV. STAT. § 400.2A-516."