Does a Wizard copying a spell count as one of their two new spells for a level?

In D&D 5E Wizards get an additional two spells per level to add to their spellbook:

Each time you gain a wizard level, you can add two wizard spells of your choice to your spellbook.

If a Wizard has a handful of Scrolls and another Wizard’s spellbook they have found while adventuring, can they attempt to scribe them all (assuming they are of the necessary spell level and have the time and money to do so), or are they limited to 2 new spells per level?