for the 1st tip is already too late...and that would be to check all the markers if they are tight...glued well...if not...try to reglue them...my advice in general would be to try to take all the markers off and to reglue them before wearing the beast...
I lost two of my markers as well...the one at 12 hrs around the pearl and one other..the little baguette...
my dealer, at that time, the magnific EL, sourced a spare case for me that is sitting in my watchbox waitin to be swapped with the faulty one...I am planning to do this for more than a year...don't ask me if it is FS, cause it is not, tried to take some markers for other members from the faulty case and didn't manage...so that's not an option...
hopefully somebody will be able to offer you some spares cause I know that some members bought these just to have the spare case (yep, I know at least two sold in the 100$ range...and I missed them both!)
good luck in your search!