Regarding the cancellations already identified by the previous owner, I think that a sound piece of advice has already been given (especially if you intend to sell them): try to group them together by guberniya (using the K&R list) and by wider area (for example, Russian Poland, Latvia, Lithuania, Siberia, Caucasus, etc).
I will go through your scans and point out the cancellations that, in my opinion, stand out among the others. To avoid loading up too many images here, I have grouped together the cancellations I will be discussing below:
Scans 28 to 41:

(scan 28) 1R Arms - cancellation of
Naryn, Semirechenskaya oblast, Turkestan (present-day Kyrgyzstan).
(scan 30) 7R Arms - cancellation of
Kara-Tygay, Tyrgayskaya oblast, in present-day Kazakhstan.
(scan 32) 10R Arms - cancellation of
Zeya, Amur oblast in eastern Siberia.
(scan 33) 1R Arms strip of 5 - cancellation of
Arkhangelsk International Parcel Otd (=sub-office). December 1917 use.
(scan 37) 7k Romanoff strip of 3 - cancellation of
ST.NOVKI / MOSCOW-KURSK ZH.D (station Novki / Moscow-Kursk Railway). This cancellation is listed, but not illustrated by K&R. Notice a late use of a cross-date canceller.
(scan 37) 1R Arms pair - cancellation of
Izhevskiy Zavod (=factory), Vyatka. This is probably a postal facility on the grounds of the Izhevsk Machine Building Plant (maker, among other things, of the Kalashnikov rifles).
(scan 41) 5k Arms - cancellation of
ST.KRILOVSKAYA, Kuban, Northern Caucasus. Listed, but not illustrated by K&R.