Bryce Harper bat

[Roady]

I have a Bryce Harper bat that I bought in 2010 as game used. The story behind it that was told to me was that Harper had donated the bat to the local Boy Scouts and it was auctioned off.
It is the same model as this one on Ebay http://www.ebay.com/itm/Bryce-Harper...item25a930c59b

Mine also has 31 written in silver marker on the barrel end. I have messaged the seller on Ebay and ask if he knew what team Harper played for when he wore #31. He hasn't responded.
I figure it was a summer league or something similar.

I was also told that mine was used in 2009 model not 2010 like the Ebay one.

I just took the last pic to show the model number on the barrel. The other pics are from the original Ebay auction in 2010.

Does anyone have any info at all on this bat and the 31 on the end?

Thanks