Yes but can you define "large deposit". 800k PCN is large or not?
Not sure. I haven't done many deposits but I had one of 1 million held over.
When PEEP/BTC was first listed on megacrypton the maximum buy/sell amount was 1000 PEEP, which was ridiculously low, so I guess they may have some defaults which don't work with certain coins. I have asked them to consider raising the deposit review limits for PEEP.
I have done a couple of large deposits, they all went through. You can post on the chatbox and they will check for you. Just send them the TX and they will make it happen.