I know this! Or at least part of it. From my tour of his orchard:
Jerry explained his naming scheme to me. The pawpaw named 275-56? That tree is located in the row 275 feet from his property line, and is the 56th tree (spaced 5 feet apart). The idea is that, when he is long gone and somebody is trying to recover cultivars a century in the future, they will still be able to locate everything.
I don’t know what VE is, but he has a few different fields, so I imagine it indicates one of the fields in particular.