He is from the Supermarket (3200) and the yellow thing is a bunch of tennis balls (from e.g. 4509)!
Most of your accessories are from the shopping mall http://playmodb.org/cgi-bin/showinv.pl?setnum=5485The figures are from elsewhere.
All depends what theme you want. As a System X building set for retail or related in modern City Life theme it's a great building. That's not really your era though, so I think you are fine with skipping it.