I don't know what yours look like, but I've seen two different types of catches on Boler
1) You pinch a square on both ends simultaneously
2) There is a single button that you press with your thumb
Both are available at Vintage Trailer supply on this page:
#1 "Pinch catch" looks like an exact match, while #2 "Brass push button cabinet latch" has a slight convex hump and a linear pattern, whereas the originals I've seen have a slight concave hump and a pebble pattern - but they are pretty close.
I've seen other varieties of #2 at other RV suppliers, with different embossed patterns - but always with the convex hump. However, since the closet is a "solo" handle, away from the others, it might not be that obvious (or perhaps you have an even less obvious location and can switch a couple of catches).