New guy here. I love this place. Especially Boputnam's "how to refoam" thread. That is SO sweet.
Two questions for now:

Is there any way to figure out the year my speakers were built/sold based on the serial #s?
I have:
L100A's # 171121A & 171893A
L50's # 65414 & 65418
L36's # 51017 & 51015


Also, I could use some help from the married guys out there. I need more believable excuses to slip my ever increasing pile of hi-fi gear past the wife. I've already used "I got these for $10. No, really." (that one was true) and "No no no...this was in the garage behind some boxes. Yeah...it's been there for at least a year." Any others would be much appreciated.

Thanks.