Unless you live in a high-crime area where you can get robbed, your ONLY risk should be sudden shutdown of liquidation avenues.
If you worry about misplacement or losing cards or MO, STOP now and do not do any MS. You're not smart enough for it.
And the loss of liquidation is only a risk if you're MSing with money you can't float, which is also a big NO-NO. So that said, MS properly done is a ZERO risk venture. Just comes down to profit vs. time spent.