I know it might sound foolish but I believe that I might have been in this scenario:

If you've used the "sweep" functionality in Electrum to import private keys, it's important to understand that this process typically involves transferring the funds from the imported address to a new address controlled by the wallet. This means that after sweeping the private keys, the funds associated with those keys are no longer stored at the original address but have been moved to a new address within your Electrum wallet.

So if I have the seed and the private keys but I'm still unable to see the funds, what I'm supposed to do?

I've been thinking and I believe it is worth to try. I have nothing to lose, I've already considered the funds gone or stolen.

So assuming when importing the wallet I have used he sweep functionality, how can I see if that address were the funds were sent it's associated with my electrum wallet?