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You can easily check this yourself. Fill the boiler until the glass is full and then another 45 to 60 seconds. Then stick your head under the boiler and see if you see water dripping. You don't need any degrees or licenses to do this. This will give you the critical information that you need

The individual that installed your existing boiler followed the instructions properly. That is rare to find someone that knows how to get it right the first time. When you get the replacement boiler (if needed) the piping should look very close to what you already have. Sometimes you may get someone that has no clue and will redesign the piping because it is less expensive, Don't let that happen!!!

As mentioned by others overfilling a boiler will not make it go bad. overfilling the boiler may have discovered a leak that you otherwise might not have found, but you want to be sure that you really have a leak and not just a defective steam vent the let water out on the floor as a result of overfilling. Second opinion is always a good idea. If you live near a steam boiler expert, chances are you will find one in the "Find A Contractor" link at the top of this page.

Using the same size as the old one may also be a mistake. If the previous contractor selected the wrong size boiler, you will want to correct that with the replacement boiler. If you even need a new boiler.