All keychains mentioned are from my personal collection with paper hangtag intact
and were purchased from S@H or a LEGO Retail Store. There may be additional
examples that I am not able to verify.
For all of mine the s number in () corresponds to the copyright year printed
on the hangtag. For example (s17) indicates 2017.
My keychain Tiles with LEGO logo referenced in this post all have the molded
number of 91873. Searching 91873, even when adding the asterisk*, takes one
to the plain 48995, making it difficult to find them to determine how the missing
ones need to be added.
So my questions are
Do the different (s number)s rate their own BL part number, or just a variable
dates note?
If they rate their own BL part number, shouldn't they be listed as 91873
if that is the number molded on the part?