Briggs & Stratton locks from at least 1935 thru 1956; the key series was P1251 thru P1500 thru all those years. Most locksmiths and key shops have functional blanks but of course not duplicates of the originals with regard to branding. There are keys reproductions with Packard logo on them available though not quite like the originals, I see them occasionally on eBay but you might also try Jesser Lock.
With only 250 different keys used, borrow keys from your local Packard buddies, you might get a fit.
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