There is uncertainty on these issues, Herder, but here's what I know:
1. The FBI found multiple shards in the sand after they started digging in and around where Brian found his three bundolas. Those shards, estimated to be about 10 or so, were placed into Plasticine evidence envelopes by FBI agents. We have video confirmation of this from the KATU cameraman who posted his copy on the Internet a few years ago. KATU subsequently forced him to take down the video. These shards and their placement in the beach sand were confirmed by SA Dorwin Schreuder when I spoke with him a few years back. It is my understanding that he has shared similar perspectives with other Cooperites, such as Georger. Whether these shards were found down to a depth of three feet is up for debate. There are bootleg copies of the KATU video floating around.
2. Continuing, Dorwin, who was the PIO for the dig and then later took over the Cooper case from Himmelsbach, told me that they did indeed find money fragments to a depth of three feet and within a radius of about 20 feet from the spot where Brian found his bundolas.
3. SA Ralph Himmelsbach wrote in his book that they found money to a depth of three feet. Al Fazio, however, says that is bullshit. Ironically, Al may have not been on the beach when the money was found at depth, presumably via shovel work, because the FBI had detained him on Lower River Road and was denying him entrance to his property. The timeline for this sequence of events is a bit hazy, though. But when he did arrive, Al and his brother, Richard, were asked to join the dig with their backhoes and then the FBI began digging at depth in a large scale manner.
4. The deep stuff, along with surface shoveling, was sifted through grated boxes, and thousands of teeny money particles were recovered. Those made it to the FBI evidence depository in Seattle and were filmed by the Citizen Sleuths in 2009/2010.
5. Once those 10 shards in envelopes left the beach, they disappeared. No one I have spoken with has ever seen them.