Depends on your kinds of humus and how light he is.
For some kinds I use humus, with Toresa and perilte.
Some kinds of cyps like to grow in that kind of mdeium, but it have to stay light and fresh. .
in some spots of upstate ny, cyps reginae and parviflorum var parv grow in flowing water filled with humus (black muck); well, very slowly percolating water
The only reason I would use it would be for the beneficials in the humus. If you don't want the beneficials then coir is a cheaper option. I believe coir is what Orchids Limited uses to grow there Cyp. mixed with perlite.
If you use humus, You have to feed it to have the beneficials work and try not to use salt based fertilizers.
Are you planning on dividing your cyps? Or are you expecting a big shipment of new stuff? That's a lot of substrate you have divided over those crates.
have you divided cyps before? Have you any tips?
When I did it a couple of years ago most of the plants went backwards in the following season.
They took at least a year to recover and I was very careful, following Mr Weinert's example on his web site ( www.cypripedium.de) to the letter.
The most important thing I discovered was to keep the roots damp at all times when out of the substrate.
Hopefully it will come.
Have Ice packs on the formosanum and change it every 2 days, to keep them cold.
My wife call me crazzy.
They are calling for snow on thursday. So hope it will come