new cam-valve /lifter tap. Help!

Just had my new Compcam XE268 installed Wednesday at the local racer shop. When I picked it up I noticed it had a little tap. Knowing the mechanic had just backed it out of the garage after installing the cam and doing the break-in, I wasn't concerned. After taking a few stop signs and turns, I wound up at the red light at the highway and noticed the tap bouncing off the car next to me. The car was warmed up and lifters fully pumped. I called the shop and did not hear back. Called the next morning and asked to talk to the installer who told me to call Compcams if I thought I had a bad lifter. I wanted to know what he thought. He is the racer. I refinish floors for a living. I am not happy and when I asked about my lifters being put back in the box in order so I could sell the cam, he said he did not do it, they should just buy new lifters. Common sense told me he probably did the same thing with my push robs and just took them all out and put them in a cup. Aren't they supposed to be kept with the specific rocker they mated too, just like lifters and cam lobes? After $800+ for installation, I am worried if this is just a valve tic or if there is any chance of damage. The old cam was a Voodoo with 454/475 lift. The new cam is 477/480 lift so there is no radical departure there. I know there are a lot of racers/builders on this site. Please help. Thank you.