I believe at least one was used in the SCW?
If so, Ian 's got a sale here!
Sadly, that´s an unsubstantiated myth, according to Steven J. Zaloga... apparently, T-26s and BT-5s are well-documented, but the T-28 appears to have been a misidentification, perpetuated by subsequent publications.
Of course, you should STILL buy one, just for the lovely model. I´m seriously tempted, and I don´t even plan on doing Winter War soviets...