Garbage? I hope that it is, but the former Soviet Union had knowledge of our numbers of tactical nuke arty and responded in like numbers. Where all those arty shells are now is anyone's guess. I hope there is some documentation from Russia as to there whereabouts, and that Tancredo can - with reasonable assurance - can put this to rest.
For info on nuke arty, see this link:
http://en.wikipedia.org/wiki/Nuclear_artillery
"Only one type of artillery round other than the W-48 was produced in large numbers, the W-33 for use in a 203 mm shell. Around 2,000 warheads of this type were manufactured from 1957-65, each 940 mm long and weighing around 109 kg. They were fitted in the T-317 AFAP and fired from a specialised howitzer. The warhead yield was greater than the W-48 and it was made in four types, three yielding 5 to 10 kt and one 40 kt.
In 1991 the US unilaterally withdrew its nuclear artillery shells from service, and Russia responded in kind in 1992. The US removed around 1,300 nuclear shells from Europe and reportedly dismantled its last shells by 2003."
An 8" x 36", 250# shell that can yeild a 10kt blast could easily be smuggled into the US by container, truck, or automobile.