I got the same results as Jeff today, but after reading your post, I took a look at my canned searches on eBay.

I usually search Titles and Descriptions using [Heuer -Tag] which was to increase the signal to noise ratio by eliminating all the Tag varieties.

However, looking at most of the pre-Tag items you pointed out, they almost all have the "Brand: " field filled in as "TAG Heuer" causing them to be filtered out.

Now I need some new saved searches. Blech.