On topic: Leave your old hardware the way it is, for historical reference.
Off topic: Coins are so boring ;) (though they last and are dated; I admit I
have used them myself, though). When I backfilled my excavations of a 3000
BC temple mound on the Peruvian coast, I put a basket-full of old shoes in
first (the site was being used as the modern town's garbage dump). In
another case, I dumped a load of washed and sorted shells in a pit at a
village site, and put in a dated newspaper page. A few years later, another
group re-excavated at the village, found the shells, but thought the
newspaper was intrusive (there is a lot of site looting in Peru) until they
happened to mention to me the "cache" of shells they found, whereupon I told
them what had happened.
-----Original Message-----
From: Ethan Dicks [mailto:erd_6502@yahoo.com]
Sent: Thursday, October 04, 2001 10:17 PM
To: classiccmp(a)classiccmp.org
Subject: Restoring classic kits we built way-back-when
<snip> Specifically, I have several things <snip> that
I made when I was a teenager. <snip> I'm debating re-soldering these items
<snip>
I took history and archaeology in school; <snip> When my
advisor restored the bed of a large monochrome mosaic near Isthmia, he
threw several modern coins into the concrete bed so that future
excavators would know that it wasn't ancient concrete.
<snip>
-ethan