Check if epub is valid (At open it)

[DnK]

In English with translator:

I have a large collection of epubs, specifically that of [pirate site], which is about 50,000 books.

And today I realized when I went to open one that it gave me a corrupt zip error. And I wonder if I have any more in this state, is there any way to check if the epub opens?
I have tried some like "Quality Check" and "Epub Check". But it has nothing to test if it opens only the epub, the two test other things.

En castellano:

Tengo una coleccion grande de epubs, concretamente la de [pirate site] que son unos 50.000 libros.

Y hoy me he dado cuenta al ir a abrir uno que me daba un error de zip corrupto. Y me pregunto si tengo alguno mas en este estado, hay alguna forma de comprobar si el epub abre?
He probado con algunos como el "Quality Check" y "Epub Check". Pero no tiene nada para probar si se abre solo el epub, los dos prueban otras cosas.

[DNSB]

I'm tempted to say check with the ebook store from which you obtained the epub ebooks but given that, as far as I am aware, [pirate site] is a rather well know ebook piracy site, I suspect that you will get little help from there.

And hopefully even less help from here.