First of all, make sure you are giving him ample room to sniff around. Place 4 pads together in a large square - he'll have more success because the area he's allowed to "go on" is bigger. Also, until he's acclimated to your home and your routine- place those pads in as many places as you can. Success is the key - praise him lavishly when he goes on them.
Is he crate trained? Even though he is 6, you might want to look into getting him a crate. Even pad or paper training is so much easier when the dog is being crated. Take the introduction to the crate (should you decide this would be a good thing to do - and everyone knows that I am one of those crate training advocates
) very slow if he has never been crated before. You can refer to the article I wrote for some guidance and encouragement.
As far as not pooping- how much is he eating? Most times a dog will really "go off his feed" while adjusting to new surroundings. Take it slow. Offer him lots of food from your hand. This is a good way to bond with him and get him to trust you.
The amount he is eating and drinking will dictate how much he is peeing and pooping. I wouldn't be too concerned for the first few days - as long as you see hiim drinking and eating at least a little.
Good Luck and please keep us updated!
As long as you take it slow, let him know what you expect in a positive way - and Praise! him lavishly, I think he will settle in nicely.
Question: Since dogs are not allowed in your complex - what will happen if Chipper barks when you aren't home? Or barks during play sessions or to alert you to things outside etc? All dogs do bark... and some whine and "talk" to us a lot!
Will your neighbors hear him and complain?