I was going to swap with a user that I had swapped with before, but He had to cancel due to a house robbery. Do you think this may have been due to swapping addresses with others on Numista? Does anybody have any tips on how to keep yourself safe from stuff like this?
Some are just passionate collectors of other people's stuff.
Other than living in a society were break-ins and thievery is less common or living in a fortress, you can't do much more then using common sense. Don't flaunt your wealth, keep knowledge of your hobby to as few people as necessary, lock your doors an windows when you are away?