[mike oxlong]

the first thing i would like to know is if it works with ebay and if so, what method.

Unless It's an eBay store, do not target Individual sellers.

which method is used for each site, and which has a high probability of success (for example amazon-eb, nike-dna etc.)

It's not possible to generalize.

Apart from the DNA and the sealed box, the method depends on the nature of the Item.

the last thing i would like to know, which are the sites where these methods work.

As above.

How do you use the sealed box method?