We saw one alive and well on 29th May. Fast asleep on a platform at the very back of the enclosure behind the house
I saw something exactly there in the morning (having been tipped off) - but I couldn't see enough to identify it. Late in the afternoon two of the rusty-spotteds were quite active in the two enclosures, which are both linked to the left-hand indoor den (viewed from the front). I suppose they could have a shift system, but Occam's Razor would suggest they do not and so I probably saw one of the rusties in the morning too.
Alan