One quick note: a postal distribution center is not the same thing as a local post office. A distribution center, also known as a hub, is a large regional facility that then ships mail and parcels out to local post offices in its coverage. That tells me this mother worked at a regular local post office, not a distribution center.
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That makes it even more shocking that this went on for so long. How does someone in a local post office get away with mail theft for that long? Where is the postal inspector for that post office and what was he/she doing all that time? Surely anyone expecting delivery of valuable coins (or, really, anything else) would file a claim when their package never got delivered.
I'm a retired carrier ("mailman"), and at different times I saw two employees go down for mail theft, in really stupid ways. One was stealing envelopes containing payment for traffic tickets, and the other was stealing holiday greeting cards addressed to college students here since they likely contained money. In both instances, and very predictably to anyone with common sense, complaints of missing mail came in almost right away, and it was very easy to catch these two idiots.
I just can't understand how the local post office in this case would face so many claims of missing packages and nobody caught on for so long.