How common was it for un-documented ships (including bypassing common ports of entry) to bring settlers to the northern American / Canadian colonies 1700-1750?
I am looking for some basis (facts, examples, and / or estimated statistics) for the theory and any additional sources that perhaps they traveled to the 'new world' on an undocumented ship or arrived at an common port which would have brought them assuming to a degree that the ship was of reasonable size as referenced in an answer to this question.
For example, being they were undocumented there is still I would expect some sort of approximation on the number of undocumented immigrants just like we do today.
Background: I have been attempting for some time to locate the passage of several different individuals in the earlier days of northern American / Canadian colonies, particularly the New York's Hudson Valley and Pennsylvania regions.
I am aware that younger individuals under 16 as well as women sometimes were not documented on ship or crew manifests and individuals changed their name upon arrival.
As far as I am aware they did not arrive through the forced in-debtedness, otherwise a convict, and considering their documented life once arriving in the colonies I have ruled out they came from a life of piracy or privateering.
I have read several books on the time period and region, and contacted some of the authors such as Henry Jones on the Palatine migration to this area during these periods and they have also not found them so I am exploring other possible theories and sources to track them down.