I'm sorry to hear about Tricky. I'm wondering if one of your condo neighbours has taken her in and may not have seen the sign you posted on the mailbox. It would be best if you could literally knock on as many doors as you can to ask if anyone has seen her and give them your phone number. If you print off a bunch of flyers, you could tape one to each door in your complex or to as many as you can anyway. That way the people in your complex will also keep an eye out for her once they know she is missing.
You could also post the word 'reward' on the posters in case someone has taken her and isn't inclined to give her up. Money might inspire them to do the right thing. You wouldn't have to put an amount or anything, just the word 'reward' and then you could choose an appropriate amount if she is found. It might also get some kids to look for her to make a few dollars.
I will PM (private message found at the top right of your screen near your name) you a list of some more suggestions I have to help find lost cats. I hope you find her soon.
p.s. looking for her in the early morning or late evening or at night are good times because it is quieter and she will have a better chance of hearing you and vice versa. If you bring a flashlight you might pick up the glare of her eyes. Bring someone along if you're going out at night though!