We have a number 4 that was found in Echo Cove, JTNP on the route Ocean of Night (aka Out to Grunge). It was found and brought in Mid March. Let us know the make, model and the carabiner attached if its yours and we will get it back to you. You can call us at (760) 366-4684 or send us a pm.
What's strange is that there's only 4 ticks on that route from all of March, with one of them being private. None of the ticks mention leaving a piece behind unfortunately so it's not obvious to me who it might be (if it's even one of these ticks). No comment on the route page about a lost piece either.