Thats the whole point. The prefix that was used was FEP... Those FEP notes used can probably be said to be test notes. However, unlike the S/R, RS, 330, and AXA/EXA notes we will probably not have anyway of knowing which FEP notes were used as tests simply because each FEP note used had a random serial number and only the BoC will know which serial numbers were used. This information will be confidential and we will probably never know. When the 2005 $10 is released the first ones out will likely be with the prefix FEP and BET or BEW.
Of course, another possibility could be a similar senario to that G/R prefix from the 1954 $2 series. During the 60's the BoC issued G/R as both test and regular usage. Only certain number ranges were designated to the test issue while the rest of the G/R prefix was issued for regular circulation. The G/R test runs were returned to the BoC where they were destroyed and only a couple remain in the museum in Ottawa are there are no circulated copies that are yet known to remain. Again, this is only possibilities, if i wrote anything that is false, please correct me and lets see what others think