Most of Posti's service points and parcel lockers are in partner businesses, such as shops, kiosks, and service stations, and are usually open according to the partners' opening hours. Please check May Day opening hours on each partner's website.
Posti's own shops in Helsinki, Espoo and Jyväskylä are
open from 9 a.m. to 6 p.m. on Thursday, April 30 (Postitalo in Helsinki from 8 a.m. to 6 p.m.)
closed on May Day, May 1.
View all locations and opening hours of Posti’s service points: https://www.posti.fi/en/service-points-on-map