So ---and I'm sure that you, being a reasonable person, would agree --- one should not be too quick to give credence to a purported miracle unless it has been carefully investigated, both as to its physical aspects (ordinary forensic detective work is often relevant here) and its theological aspects (what does this mean? what is the purported message?)
This is a reliable criterion:
1 Corinthians 12:3
Therefore I want you to know that no one who is speaking by the Spirit of God says, Jesus be cursed, and no one can say, Jesus is Lord, except by the Holy Spirit.
I don't want to speak too soon about this reported Argentinian miracle, since I don't know the extent to which it has received official approval (I guess I should look that up!) --- but it seems to me, at first glance, that the "message" would be nothing more or less than what Our Lord told us:
If it's a Goddamned hoax (literally), then I suppose one could do a kind of exorcism over it, saying "Jesus is Lord," and see if the Goddamned thing blows itself to bleedin' shriekin' smithereens!
And Jesus had strong words regarding those who will not listen to the Church.
Prior to Church sanction, there also exists the following criterion. "If a kingdom is divided against itself, that kingdom cannot stand. If a house is divided against itself, that house will not be able to stand." A miracle that leads us to Jesus is almost certainly from God.