Fragments at T-Bar are reported by SA Mike McPheters and SA Ralph Himmelsbach, besides Dorwin.
Since NO one has seen them since February 12, 1980, apparently, and certainly not in the current era of Geoffrey Gray, Citizen Sleuths, or Larry Carr, there is a strong likelihood that the fragments don't exist at present.
So, the bigger question is whether they ever existed. Al and Richard Fazio say they never found any fragments, nor did the Ingrams. But we have plenty of pix revealing what appears to be fragment recovery - ie: Ralph is pointing to something in that trench, and someone is holding a shard of a 20 in a plasticine container, as posted here at the Forum.
Hence, if the fragments were found, their existence may have pointed to other issues that needed to be hidden. Hence, the fragments were disappeared.
Another scenario is that they were lost due to sloppy police work and record keeping, as revealed in the 1995 Dept of Justice Investigation of FBI Lab work, and confirmed by US Congressional hearings.
We have newspaper accounts posted here at the Forum that claim the shards were stored in Portland. Dorwin says they were turned over to the Seattle guys via the Vancouver agents shortly after the time of discovery at T-Bar. Jerry Thomas says that Ralph says all the stuff "was sent up to Seattle."
Personally, I hold all of the above in a state of abeyance - one of possible truth. It's a state of mind that I employ for much of the controversies of Norjak. I don't rule anything in, necessarily. And I don't rule anything out, either. As a result, I have a rather large mental juggling act going on all the time.