The IRS has revised Form 8300 for reporting receipt of cash in excess of $10,000. The revisions do not appear to affect the two pages of the form that are filled in by a dealer. The changes appear to be limited to minor editorial revisions and revisions to the instructions concerning taxpayer identification numbers.
The form does, however, mandate that it is the version to be used for transactions after June 30, 2011. Consequently, if you have hard copies of IRS Form 8300 that are not the June 2011 revision you should discard those. Go online to www.irs.gov and access the online Form 8300. It can actually be filled in online, and by that method you will ensure that you are using the most current form.