I am thinking the US Army Aviation Museum at Fort Rucker, Alabama may have one in their Collection but not on displayl
I seem to recall having seen one there at one time many years ago when the Museum was first starting and many Types were stored in the open at various locations near the Daleville Gate.
You might have to scroll to find the article "Three for the Money" when you open this link. It was a US Army Digest Article discussing the LOH Competition.
I found the issues being discussed to very similar to those of today as the Army tries to figure out what kind of Aviation assets it needs.
History does repeat itself!
https://books.google.com/books?id=7zxEAQAAIAAJ&pg=RA3-PA50&lpg=RA3-PA50&dq=LOH+Competition,+prototypes&source=bl&ots=nqvMFOYUiP &sig=Wwjk3tqWEUu_S_g-HEjdLmEXOi0&hl=en&sa=X&ved=2ahUKEwiu8rbu4ZLfAhUKUa0KHRsQA9kQ 6AEwAnoECAgQAQ#v=onepage&q=LOH%20Competition%2C%20prototypes &f=false
This Link takes you to the Army Report re the LOH Competition.
I found some of the Reviews of the various aircraft to be quite interesting now that we have the advantage of looking back over time.
The Hughes 369 was said to have "marginal authoritative landing capability"..... have done one of them for real in the 500D version of the 369....and it was anything but marginal!
https://apps.dtic.mil/dtic/tr/fulltext/u2/a030581.pdf