In order to have a US ham license, you need a US mailing address. It is unnecessary to use a street address even when first getting a license. I've used a POB for my ham license for most of the last five-and-a-half decades. In the distant past, when operator and station licenses were separate, you needed a street address on the station license. Nowadays you don't need a street address and don't even have to be a citizen.
I don't think the FCC keeps much of an archive, but of course every address you've used will be in the Callbook for those years (no longer published) and in such things as the QRZ CDs or the Ham Call CDs for those years. I think both of those are still published, and many hams keep back issues.
The reason I don't think FCC keeps much of an archive is that they have no record of my first license (issued in July 1957), so even QCWA thinks I'm a newcomer, a greenhorn first licensed in 1958, 'cuz that's the first Callbook I appeared in.
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-- Carl
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