Newport Aquarium and Geocashers

Today my Youth Group took a trip down to Newport Aquarium. It was a very neat place to go to! It was hard taking pictures there. Turn on flash, you get a glare. Turn off flash, you get a blurry picture. Above was the best picture I got of the sharks (and well, all of the non flash photos). We got to pet sharks there which was pretty cool too.
Well, after the aquarium we went letterboxing (with a bunch of noxers too!. When we got to the aquarium, I discovered I left the clues at home, 2 hours away. So I asked my brother to text me the clues but it failed to send. Then it wouldn't send at all. When we were done at the aquarium I called him up and he read the directions to me while I wrote them down(the things we do for letterboxing...). Well we went to the Purple People Bridge which was a short walk from the Newport Aquarium. It was a beautiful day and wasn't crowded on the bridge. We followed the clues and found the box. We had to be super sneaky because there where security cameras. We grabbed the box and walked down to the nearest bench and took a seat. We opened the box and......... the stamp was gone. There was a cheap guitar pick left in its place. It was really upsetting. We most likely wont be returning to Newport in a long time. The box is only listed on atlasquest and had no recorded finds. When we looked through the log book there were two recorded finds which were not recorded online. With the stamp gone and a guitar pick left there, only means that a geochasher must have been there. I just don't understand why a geocasher would take the stamp if it is a LETTERBOX and not a GEOCASH. I guess there must have been a geocash at the location at one point or something. I don't know. It was very, very frustrating.
I really don't like geocashers. However, I do like the letterboxers who also geocash (they are educated on both hobbies). It's just the geocashers who know nothing about letterboxing stumble upon a box and think its a geocash and then take the stamp. I found a few geocashes before while finding letterboxes. The other thing that is annoying is the hybrid boxes. A geochash-letterbox. We found one box in Virginia that was a hybrid and even though the owner wrote all over the box that the stamp wasn't part of the geocash, someone still took it. It can become very frustrating for not just me, but other boxers and the planter. I think that geocashers who don't know about letterboxing should be educated about letterboxes. I guess that is also are job to do. I think now when I place boxes I will state "This IS NOT a geocash."
Sorry about the ranting. I know others have ran into this problem too.

~Catchow