OK. Here goes. I'm the one that wrote the two abbreviations noted.
First... "URP" I picked up from my brother in Austin. It's a knock-off from the www abreviation of URL. It means "Usual Rock Pile".
Now on to the more talked about HSPEIA.
It is simply a code which represents the tracking # of a travel bug. That way, if I lose my printed copies of the cache/TB, I can still look up the number and log movement of the Travel bug. The first time I moved a TB I found out that, even though I actually had the TB, I still had to enter the tracking number to log the final move. This was after I put the bug in another cache.
Sorry it wasn't more interesting.
I'm not giving out the code though.
See who can figure it out first.
CacheReward