Well, Monday was a holiday, so it's just been Tuesday and Wednesday that have gone by with no mail... Is that unusual for you? Try and catch your mailman and ask him, he might know. You might also consider if there was a car in front of your mail box, some postmen won't get out to deliver.
Have you tried going to your local post office and making sure your mailing address is on file with your name? Or I would try to check with your mail carrier on your route and see if there is an issue. I've encountered this issue before and the problem was my name wasn't listed inside my mailbox so all my mail was returned to sender
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