If you lost the plastic anti-crossloading piece to your DMM belay biner at the Trapps, I found it. I know, this is a really MINOR thing (you can get a new one for under $3; see link below), and some folks might actually despise the thing (did you toss it aside in frustration? Shame, shame... that's littering).
Anyway, let me know if this is yours and we'll scheme a way to get it back to you. Not worth mailing, but leaving it in NP would work.
Link to the item: http://www.backcountry.com/dmm-belay-master-clip?CMP_SKU=DMM0036&MER=0406&skid=DMM0036-ONECOL-ONESIZ&CMP_ID=PLA_GOc001&mv_pc=r101&utm_source=Google&utm_medium=PLA&mr:trackingCode=44610146-9087-E011-87D9-001B21A69EB8&mr:referralID=NA&mr:device=c&mr:adType=plaonline&gclid=CjwKEAjw3Nq9BRCw8OD6s4eI5HASJABsfCIaSYyDela1ckdJ03G6-fCYK379DCf9_eKUFJpp_LYLChoC8fLw_wcB&gclsrc=aw.ds