Parents are almost always required to provide each other with current address, phone number, et cetera. These should all be in writing, including email or even text message. I've never heard of a parent being required to provide something called "official" documentation - e.g., a lease agreement or some such - and I don't imagine a court would order it absent some really good reason / extenuating circumstance.
Additionally, a curbside dropoff/pickup is not inherently unreasonable, and since it is a court order you are required to obey it. However, if the other parent has said he doesn't live there anymore, and the "curbside dropoff" provision refers to the other parent's residence, then there's no reason to drop the child off there. Of course, if the other parent says he lives there, just in a different apartment (and provides the apartment number, as you said he has), then nothing has really changed. Unless the judgment requires him to provide proof beyond his word, and he has violated that order, there's probably no good reason for the court to order a modification.
What would be a good reason for a modification is if the judgment is vague, and the two parents cannot agree on something substantial. In that case, it is reasonable to ask the court for some modifications to further clarify the parents' respective rights and responsibilities.