According to current rules, you can hold (for duration of match) 3 opponent balls and momentarily possess more than 3. Rules say 3+… does not give a hard number.
Team needs to know: if a bot is holding 3 (opponent balls), approaches a goal with 3 more, de-scores them via intake/etc (total 6), then immediately turns and ejects the 2nd set of 3, will they be within the rules? This would put them in possession of 3+ for about 5 seconds total.