I don't see any particular reason to do anything with these tags. The questions which were talking about merchandise in the store in the past are not all entirely relevant to swag in general, nor are general questions about swag entirely relevant to merchandise.
We do have full intention of eventually creating a store again in the future. It's only a matter of when we think that will be a good idea. It was originally closed down due to the amount of headache it caused between a variety of different issues; at the time it just wasn't worthwhile to have around. At some point, we grow and develop enough interest that having a store around does become worthwhile again.
Not to get everyone's hopes up, but the idea of having a store again did come up again recently. It's something our marketing team is interested in getting set up again, but we have no definitive timeline whatsoever on how long it'll take to get that set up because there's a lot of additional factors to consider in the process.
For now, I've updated the swag tag wiki excerpt to be a bit more detailed.
For questions about free gifts Stack Exchange sends out to its users for reaching milestones, contests, and other events as well as the processes behind them.
While all of the items you receive as part of a swag package can be considered merchandise, there is much more to the swag process of information collection, how you get it, etc that is just not covered by a merchandise tag at all.