Let Banco Popular collect your payments for you! Wholesale Lockbox is a service used by businesses to accelerate the remittance collection process. Have your customers mail payments directly to a unique Post Office Box. The mail is picked up from the Post Office, payments are processed, checks deposited, and the remittance documents are forwarded to you, all in the same day! Options include a traditional, paper-based lockbox as well as a state-of-the-art online Image Lockbox.