The militants' Novorossia TV channel recently reported about the discovery of Ukrainian Grad rocket systems and 122-mm rockets in the ATO zone. You can see them on the pictures.
The terrorist nicknamed Sentiabr reads the contents list of the ammunition box, signed by Ukrainian soldiers - major Kolosovskyi, captain Churilov, and lieutenant commander Hiss.
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The Ministry of Defense clarified that the abovementioned soldiers served in the Army А2327 unit based in the Crimea. Thus, they have really signed the content lists, but in November-December 2013. Afterwards, the ammunition boxes were warehoused until Russian invasion to the peninsula in March 2014. It seems quite clear that the Grad rocket systems and 122-mm rockets were transported to the Donbas from the Crimea by Russian troops.