These weren't from me, where they? GLS hands them to Chronopost France for delivery, and while I can remember one case of a supposedly stolen parcel (which was signed for by the recipient), that was quite a while ago and I had an open discussion in my thread on Meso FR about this case. Feedback on shipping times via GLS > Chronopost seemed generally fine via mail and in my Meso FR thread, so it may be specific regions of France only where Chronopost is horrible (I know such region-based differences in performance and even delivery procedure exist in Germany at least). I've had to use regular postal service a couple of times (couriers won't ship to Poste Restante) and received some complaints about shipping times so that's not a viable alternative.
Please note that couriers don't transport parcels from Friday afternoon to Monday noon and past Monday was a national holiday, so there was a huge gap where many institutions weren't working, which may explain this current delay.
I'll do a survey when Meso FR is back online and you can eliminate specific couriers when placing orders simply by adding a note like "No GLS" to your order.
edit: I went and checked tracking numbers from the 2nd half of September (that's as far back as I've saved them for) and the average delivery time to FR was 3-4 business days (2 & 5 days being outliers), so I'm not sure this is a widespread problem.