I'll have to pick some of those up. This is one of those times where you know they'll be fairly fresh. Tough to get fresh beer from Europe sometimes here and the datestamps are historically difficult to interpret/absent.
My wife spied the Sam Adams Ofest at the grocery and got me a 12 pack. It's very good, a Maerzen type.
My ofest is a Festbier type, but it's still in Diacetyl rest currently, and will need to lager a bit to be best.