yes.. just engrave the serial back onto the ball..
also I checked with bowl.com about the specs on the size of a ball..
the size specs are for the ball at the time of manufacturing.. I was told that there isn't any size specification for use of a ball in league play..
but I am pretty sure I have seen them check the size with plastic templates during USBC tournaments..
from USBC
If you are referencing "Physical Specifications" on page I-2 of the Equipment Specifications Manual, those specifications listed are manufacturing specifications. Meaning that all the bowling balls when submitted at the time of approval must meet those specifications. Specifications are on the initial manufactured ball and there is not a rule or specification on the size of the bowling ball during league or tournament play.
Thank you for your support and interest in the equipment specifications. If you have any other questions, please feel free to respond.
Nicki Mours
Nicki Mours, Research Engineer, Equipment Specifications and Certifications
United States Bowling Congress
621 Six Flags Dr., Arlington, TX, 76011
1-800-514-BOWL, Ext. 8404
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16-17 mph,350 rpm,PAP 5 1/2 x 3/8up, HighGame 300 x 3, High Series 808
Book Average 205,PBA Xperience ave180