Hi Katie,
I'm developing a base for Central Receiving to record parcel information like the date a package is received and then delivered to the recipient. The work-around that I am going to use is to have the recipient sign above the barcode and then I'll photograph the parcel with an iPad with an attachment field called Signature. This will tie the barcode of the parcel to the person that signed for it. Until Airtable comes out with a legitimate Signature field, this will be my work-around for now.