as you probably already know the freezer test doesn't work on all tests. However if you have one that did past the test there is a good chance that it is real. Just because it may not be sust 300 it could be straight prop. It is alot cheaper and they would make more money selling it to you..but it will still work..or like Mbarasso said..it could be lower amounts of cyp and higher prop..again still it will work..

good luck

can you get a pic?