Actually, it is possible that Trask gets a sample of the Red K, and so goes in and tries to force out of Irig where the rest is, since he knows it relates to Superman.
However, Bureau 39 has lots of guys, so while Trask is interrogating Irig and a few other guys are gaurding, some others are off digging up Irigs lot, and they find some green K while digging. Thus Trask will then have gree K while Irig only ever had Red K.
