With regards to box.net (now box.com) I think I know what the problem is but I dont have a solution.
box.net have now changed to box.com, they have also changed from http to https but they use a non standard cert (due to this service only being for their apps, etc.)
Therefore when I try to start the script I get the error:
Mouting davfs https://www.box.com/dav
/sbin/mount.davfs: Mounting failed.
Server certificate verification failed: issuer is not trusted
TheHijacker - you mentioned at the start that in order for you to connect to "mydrive.ch" you needed to download their pem cert but I dont know how to do this for box.com, I dont think they provide any documentation for this as technically WebDAV is unsupported by box.