how can people proof it's alien flying object?

1st it's flying & usually only visible for few seconds/ minutes to an unsuspecting peoples.

2nd any picture & or video will always be said to be photoshoped, cgi, lens anomalies, bird & weather balloon either by normal people, gov, & media.

3rd if there any crashed obj, special op from gov will take it & say it's a weather balloon.

Maybe the only way too proof it is just to wait so the government officially announce e.t. presence/ wait till their craft land publicly.