Wow! Um, are you sure it wasn't just some farm boys messing around? Don't get to freaked out just yet! Can you get Air traffic control transcripts in your texas area? It should give you all the call signs that were airbourne at that time, then just google them for the chopper description? May work? Plus, they had to get fuel from somewhere, BP, SHELL, ETC ETC from a local airport maybe? Give em a call they may be able to tell you a rego from the description you give? Hope you both are ok?