https://www.ancient-origins.net/news-history-archaeology/sardinia-coin-hoard-0019748 (https://www.ancient-origins.net/news-history-archaeology/sardinia-coin-hoard-0019748)
Military paychest? Tax shipment?
tax avoidance!
This bit caught my eye "The span of their minting dates from 324 AD (starting with Licinius' coinage) to before 346 AD—the absence of centenionales, which began minting at that time, solidifies their age. The coins have been traced back to nearly all the empire's mints active in that period, with a few notable exceptions."
yep, could be tax collections or a well travelled Senator