It's a crapshoot. We do a combo of drop off, pick up, and blue box drop offs. We have had, at a prior location, a carrier who would skip our pick ups if it was raining. At the new location it's much better, but we just recently got a new driver and they have let a bag of 200 packages sit, somehow, for almost a week before anything was scanned. At the last location I complained to the postmaster and things were fixed for a week, until all mail was held sporadically, seemingly as a malicious reponse. I learned my lesson and won't say anything, but it's costing me money to address the tracking emails.