Have you ever,
ever exported your hold, ever? If so, you may be able to recover some of the stuff by exporting the current version to a file that isn't the old one, importing the old exported hold, copying the level to a new hold, importing the more updated version of all the non-missing levels, and pasting the level back in. (Apologies if I'm stating the obvious)
I know it won't help
now, but if you're not doing it, I highly recommend exporting a hold file periodically as a backup for this sort of thing, it's helped me immensely.
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109th Skywatcher
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[Last edited by Xindaris at 02-01-2016 01:16 AM]