Is this a good deal for the MP purple shaft 284 528 solid lifter cam and lifters new in box.

Looks used to me, as well. Unless the lifters are matched to the lobe they came from on a cam that's been run, you'll need new lifters. I wouldn't trust that someone matched the lifters when they were removed. I'd pass on a used cam, unless I personally removed it, matched lifters and inspected the lobes.