What happens next with this equipment
7TP were used only for trials and there is no evidence that they were used during war. There are stories that in Kubianka museum was one 7TP until around 1970 and destroyed around this time
C7P were used in arty units one wreckage found near Volgograd (Stalingrad) and restored as a T-26. What is intresting in that times they were use by Germans, Romanians and Soviets. this particular wreckage was identified as probably Romanian.
http://forum.ioh.pl/viewtopic.php?t=8683
as "T-26" in Museum
http://www.dishmodels.ru/wshow.htm?p=244
TK-3 and TKS were captured in bigger number + one complete company in Estonia during annexation in 1940