honestly, it depends on the school. First, schools have different interview formats, - single interviewer/single person, multiple interviewers/single person, single interviewer/multiple people (heard about that but never saw in person). so depending on the formats, rules will be different.
Some schools do not show interviewers any information except essay and basic personal info. Some show everything. So, it you interviewed in the first type of school, they probably didnt see your LORs at all.
next, some schools allow interviewers "free flow" the conversation completely, others have a list of questions, others do a mix of both. So interviewer has a certain agenda most of the time, and they honestly might not even worry about LORs, - they have stuff to ask you and to find out, you know?
next, time limits - schools who have only 30 or 45 min probably do not have time to ask you extra stuff. While in a free flowing 1 hours interview they might find time.
so, short version, - it doesnt mean any. Everything depends on the school, dont worry about it.