Missing DISA Flap (Pin still present)

[Dark_stranger]

Whilst replacing some split piping today I removed the DISA and upon taking out the DISA, the flap was missing, although the pin was still there. I put my hand in the manifold to see if I could feel the flap, but nothing. I have done lots of search on the interweb and there are 2 possibilites, 1 that it snapped and is in the manifold or 2 that a previous onver removed it? either option, i have no real way of knowing unless i take a manifold apart. That said, what damage could the flap cause? and where could it work its way into? I have the car in the garage tomorrow and debating if the pay the garage to strip the manifold? would prefer not to.