Structured Data Questions

[djlittman]

I am showing 2 items with errors.  These products have both been removed from the site, and will trigger a 404 Page Not Found.  I am still seeing the page URLs in Webmaster Central > Search Appearance > Structured Data.  They are shown as items with errors, the errors being that they are missing price too.

Should I 301 redirect these on an htaccess file, or should I remove the page url in some other way from Google?

Also, I have a site with over 50,000 products and 2,000 category level pages.  In Structured Data, there are only 2,848 items.  Does it seem like Google is collecting very little data compared to how many urls I have on my site?

[EcommerceSite]

How long have the items been showing an error? Webmaster tools seems to be a little slow some times. I made a small mistake in my markup that caused me to have errors. It is now been fixed but it has just slowly been declining for 3 weeks and still has quite a ways to go.