I understand you’re looking for no-deposit bonus codes for Slots of Vegas from May 2018. However, I should inform you that:

1. **Expired Codes**: Casino bonus codes, especially no-deposit offers, typically expire quickly – often within days or weeks. Codes from 2018 would be long expired and unusable.

2. **Casino Status**: Slots of Vegas (operated by Deckmedia) has had significant regulatory issues. They lost their gaming license in late 2018/early 2019 and are no longer operating legally in most jurisdictions.

3. **Safety Concerns**: Even if you found old codes, attempting to use them on this casino would be risky as they’re not properly licensed anymore.

**Instead, I recommend:**
– Looking for current, legitimate casinos with proper licensing
– Checking reputable casino review sites for current promotions
– Always verifying a casino’s license status before playing
– Being cautious of sites offering “old” bonus codes

If you’re interested in current casino bonuses from reputable operators, I’d be happy to suggest some general tips for finding legitimate offers safely.