According to Trinitarians, if Jesus was saying things that clearly made Him out to be God, why didn't Caiaphas mention it at Jesus' trial?

Jesus claiming to be God would have been a clear case of blasphemy (unless, of course, he actually was God). Yet before his trial, according to Matthew 26 > "Now the chief priests and the whole Sanhedrini were seeking false > testimony against Jesus in order to put Him to death. 60 But they did > not find any, though many false witnesses came forward." Given Trinitarians claim there is clear evidence of Jesus claiming to be God (such as 'Before Abraham was, I am' and 'I and the Father are one') and that the statements were made publicly in front of a hostile group of scribes and Pharisees, why couldn't Caiaphas find any witnesses to attest to these statements, and instead had to seek false testimony in order to put Him to death?