Boosted Machinist -- No Level 60 Gear Coffer

Date & Time: Within the past three months, I'm guessing.
Frequency: N/A
World name: Balmung
Character name: Opheaux Cobonte
Class/Level: Machinist Level 70 (Currently) Issue lies within level 60 Machinist content
Party or solo: Solo
In-game time: N/A - Unknown

Hi! I've been playing on a boosted Machinist for months now, and I've had the reoccurring realization that I cannot find the Machinist Armor Coffer rewarded from the level 60 job quest. I've checked my journal repeatedly; have the quest don't. I have the achievement and its title it rewards -- I have every job quest done up to level 70. I've received the level 70 gear and am able to re purchase it via the calamity vendor, but the vendor comes up empty-handed when I want to 'repurchase' (or initially purchase in the first place, anyway) level 50 gear or really anything from 60, down that relies on job quest completion.

I've been at a loss, because the only way I've been seeing to get this armor, that I either wasn't rewarded upon boosting the character, or inadvertedly deleted along the way, is to start getting into clan hunts and rebuy each individual armor peace with centurio seals. It all just seems a little odd since the mission was 'finished' upon the level 60 boost, and I didn't get any of the tangible, ingame rewards. Titles are nice, but glamours are everything!

I don't have any date or time information, other than it could've been just after my purchase of the job boost and I can provide if needed. If I can avoid having to get into clan hunts, I will!

Any help is appreciated and thank you for your time!

The Calamity Salvager only sells items that could only be gotten from specific quests and achievements. Since the gear from the level 50 and 60 MCH quests is already available by other means (and wasn't even originally given by quests), you can't buy them back.