A couple of general points which may be useful to some, one specifically wrt the above statement, one to the OP.
Whilst scheme's don't 'hunt down' people for small payments, trustees will make reasonable effort to ensure members approaching retirement are aware of their pensions. For example,the trustees are likely to have instructed the scheme's administrators to write to a member a fixed period, often 6 months, prior to the scheme normal retirement age. They can only do this based on any contact details that they have, and it's up to the member to keep these up to date. If no response is received back, for larger pensions they may make a second approach, based on the practice the trustees have agreed with their administrators, and anyone over a certain age, such as 70, who has not accessed their pension will be flagged up in the management reports reviewed by the administrators and trustees. But essentially, it is indeed the responsibility of the member to be in control of where their pensions are, and when they are accessed.
WRT the OP, as many may be aware, the term 'trivial' has a specific meaning in the pension industry. If the aggregate of an individual's pensions is less than £30k (based on the sum of any DC pots, and using the 20 x rule for DB pensions), they can, subject to various other conditions being met, be taken as 'trivial commutation' in one go. It's something that benefits the individual, and also the scheme as it avoids future costs of managing small pensions and paying them out monthly/in small sums. I don't think this is what the OP was meaning, but I thought I'd throw it in anyway in case it helps any other readers of this thread.