Those symptoms are consistent with ophidian paramyxovirus and reovirus. As mentioned, IBD reptarenavirus is known in colubrids.
I'll second the comment that insects are not at all a suitable diet. The snake will need to eat appropriately sized rodent prey for its entire life, starting immediately (the nutritional profile of insects is completely inadequate for a growing snake, and it can be expected to show malnutrition symptoms very quickly -- weeks). It either needs a proper (i.e. rodent) diet or it needs to be rehomed.
And not to pile on, but box turtles are very much less tolerant of deviations from ideal care than are rat snakes. Box turtles, especially when first acquired, are very willing to take ill in a variety of ways and tend to be relatively unresponsive to treatment. I've had simple infections in mine that required multiple vet visits and antibiotic injections for months. One of ours was ill for nine months before we (vet didn't find it) finally figured out it had amoebiasis. Their nutritional and housing needs are also not insubstantial.
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