At the end of A matter of time, Rasmussen gets caught, and Picard says, dramatically: Trying to make my history unfold in a way other than it already has, eh, Professor?
But they let the pod itself return to the 22nd century, without even remarking on it! Perhaps they couldn't stop it, but they didn't even try. And within that pod were still al those 'trinkets'. Who's to say that someone else wouldn't find it and open it? Anyone doing that and exploiting the finds still could alter history. Or were they so confident that, since they couldn't open it, no-one from between the 22nd century and their own time would be able to, either?
But they let the pod itself return to the 22nd century, without even remarking on it! Perhaps they couldn't stop it, but they didn't even try. And within that pod were still al those 'trinkets'. Who's to say that someone else wouldn't find it and open it? Anyone doing that and exploiting the finds still could alter history. Or were they so confident that, since they couldn't open it, no-one from between the 22nd century and their own time would be able to, either?